Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Oct. 01, 2017
Assets:
Total short-term investments	$ 106.6	$ 228.6
Available-for-sale securities	363.5	542.3
Total Assets	4,171.8	3,271.0
Liabilities:
Total Liabilities	48.2	38.5
Goodwill	3,674.8	1,539.2
Intangible Assets, Net (Excluding Goodwill)	1,246.2	441.4
Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	3,661.4	2,462.3
Short-term Investments [Member]
Assets:
Available-for-sale securities	25.4	151.7
Trading securities	81.2	76.9
Total short-term investments	106.6	228.6
Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	24.1	13.4
Long-term Investments [Member]
Assets:
Available-for-sale securities	363.5	542.3
Other Long-Term Assets [Member]
Assets:
Derivative assets	16.2	24.4
Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	20.8	16.4
Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	27.4	22.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total Assets	3,865.2	2,748.1
Liabilities:
Total Liabilities	4.6	2.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	3,661.4	2,462.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	10.5	81.4
Trading securities	81.2	76.9
Total short-term investments	91.7	158.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	0.0	0.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	112.1	127.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets	0.0	0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	4.6	2.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total Assets	300.7	517.0
Liabilities:
Total Liabilities	43.6	36.0
Significant Other Observable Inputs (Level 2) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	0.0	0.0
Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	14.9	70.3
Trading securities	0.0	0.0
Total short-term investments	14.9	70.3
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	24.1	13.3
Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	245.5	409.0
Significant Other Observable Inputs (Level 2) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets	16.2	24.4
Significant Other Observable Inputs (Level 2) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	16.2	13.9
Significant Other Observable Inputs (Level 2) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	27.4	22.1
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Total Assets	5.9	5.9
Liabilities:
Total Liabilities	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Trading securities	0.0	0.0
Total short-term investments	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	5.9	5.9
Significant Unobservable Inputs (Level 3) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities	0.0	0.0
Significant Unobservable Inputs (Level 3) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities	0.0	0.0
Agency Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		7.5
Agency Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.5	21.8
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Agency Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		7.5
Agency Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	8.5	21.8
Agency Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Agency Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Commercial Paper [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.0
Commercial Paper [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.0
Commercial Paper [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Corporate Debt Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	14.9	49.4
Corporate Debt Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	165.9	207.4
Corporate Debt Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Corporate Debt Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	14.9	49.4
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	165.9	207.4
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Foreign Government Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		7.1
Foreign Government Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	12.0	17.1
Foreign Government Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Foreign Government Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Foreign Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		7.1
Foreign Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	12.0	17.1
Foreign Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Foreign Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
U.S. Government Treasury Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	10.5	81.4
U.S. Government Treasury Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	112.1	127.4
U.S. Government Treasury Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	10.5	81.4
U.S. Government Treasury Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	112.1	127.4
U.S. Government Treasury Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
U.S. Government Treasury Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
U.S. Government Treasury Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
U.S. Government Treasury Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
State and Local Government Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.0
State and Local Government Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	7.0	7.0
State and Local Government Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
State and Local Government Obligations [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.0
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	7.0	7.0
State and Local Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
State and Local Government Obligations [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Certificates of Deposit [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.3
Certificates of Deposit [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Certificates of Deposit [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		2.3
Certificates of Deposit [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities		0.0
Auction Rate Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	5.9	5.9
Auction Rate Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Auction Rate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Auction Rate Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	5.9	5.9
Mortgage and Other Asset-backed Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	52.1	155.7
Mortgage and Other Asset-backed Securities [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	0.0	0.0
Mortgage and Other Asset-backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	52.1	155.7
Mortgage and Other Asset-backed Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities	$ 0.0	$ 0.0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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